CN104426348A - Power factor correction circuit - Google Patents

Power factor correction circuit Download PDF

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Publication number
CN104426348A
CN104426348A CN201410400757.XA CN201410400757A CN104426348A CN 104426348 A CN104426348 A CN 104426348A CN 201410400757 A CN201410400757 A CN 201410400757A CN 104426348 A CN104426348 A CN 104426348A
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CN
China
Prior art keywords
power factor
voltage
factor correction
circuit
unit
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410400757.XA
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Chinese (zh)
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CN104426348B (en
Inventor
朴赞基
李载昊
陈昊相
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LS Electric Co Ltd
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LS Industrial Systems Co Ltd
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Publication of CN104426348A publication Critical patent/CN104426348A/en
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Publication of CN104426348B publication Critical patent/CN104426348B/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/70—Regulating power factor; Regulating reactive current or power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/0085—Partially controlled bridges
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/062—Avoiding or suppressing excessive transient voltages or currents
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/125—Avoiding or suppressing excessive transient voltages or currents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

Provided is a power factor correction circuit correcting a power factor of AC voltage. The power factor correction circuit includes: a rectifying unit stopping rectifying the AC voltage in a transient state and generating an rectified voltage by rectifying the AC voltage in a steady state; a power factor correction unit generating a power-factor-corrected voltage by correcting the rectified voltage; a smoothing unit generating a smoothed voltage by smoothing the power-factor-corrected voltage; and an inrush current limiting unit providing a limited current by limiting an inrush current generated by the AC voltage in the transient state and stopping providing a current to the smoothing unit.

Description

Circuit of power factor correction
The cross reference of related application
According to 35U.S.C.119 and 35U.S.C.365, the application requires that the application number submitted on September 2nd, 2013 is the priority of the korean patent application of 10-2013-0104934, its full content is incorporated herein by reference.
Technical field
The disclosure relate to a kind of by being limited in initial condition that AC electric power connects time the surge current that occurs carry out the circuit of power factor correction of protective circuit device.
Background technology
Because in AC circuit, the phase place of voltage and current is not necessarily equal to each other, therefore their product not all will become effective power to be used.The ratio of the product of voltage and current and active power (that is, effective power to be used) is called power factor.If make power factor be less, then for preventing the circuit of power factor correction of this loss to be widely used in various electronic installation owing to there is many transmission power loss.In addition, some countries that are arranged on of this circuit of power factor correction become enforceable.
Charging device for charging to the battery of motor vehicle requires circuit of power factor correction.When battery initial charge, because the capacitor of the smooth unit in circuit of power factor correction is also uncharged, therefore there is surge current.Surge current refers to the streaming current when electric power is applied to distribution wire or electronic installation higher than normal current.About surge current, one connects electric power, and the electric current corresponding to several times or decades of times normal current just flows and reduces gradually, disappears subsequently when reaching stable state.If such a this surge current flowing, the electric current higher than the maximum permissible current of device flows in circuit.Consequently, may break down with malfunctioning.Thus, the device for limit inrush currents is needed.
Summary of the invention
Embodiment provides so a kind of circuit of power factor correction: it is for when using the circuit of power factor correction of such as charging device for electric vehicle, and the device in protective circuit is from the impact of the surge current occurred when applying the initial condition of AC voltage.
In one embodiment, comprise: rectification unit to the circuit of power factor correction that the power factor of AC voltage corrects, it stops carrying out rectification to AC voltage and in stable state by carrying out rectification to produce the voltage through rectification to AC voltage in transient state; Power factor correction unit, it is by correcting the voltage after producing power factor correction to the voltage through rectification; Smooth unit, it is by producing through level and smooth voltage to the voltage after described power factor correction is smoothing; And surge current limiting unit, it provides limited current in transient state by limiting the surge current produced by AC voltage and stops electric current being provided to described smooth unit.
In another embodiment, circuit of power factor correction comprises: multiple bridge diode; Power factor correction unit, it has the input terminal of the lead-out terminal being connected to described multiple bridge diode; Smmothing capacitor, it has the one end of the lead-out terminal being connected to described power factor correction unit; Switch, it has the one end being applied with AC voltage; Diode, its one end is connected to the other end of described switch; Resistor, its one end is connected to the other end of described diode; And current controling signal generation unit, it is connected described switch in transient state and prevents two top bridge diodes among the described multiple bridge diode of electric current inflow, to allow described resistor, the electric current being limited size is provided to described smmothing capacitor.
In another embodiment further, a kind of method that circuit of power factor correction is operated, the power factor of described circuit of power factor correction to AC voltage corrects, and described method comprises: determine whether described circuit of power factor correction is in transient state; When described circuit of power factor correction is in the surge current that transient state limit produces by AC voltage; When circuit of power factor correction is in stable state by carrying out rectification to produce the voltage through rectification to AC voltage; The voltage after power factor correction is produced by carrying out power factor correction to the described voltage through rectification; And by producing through level and smooth voltage the voltage after described power factor correction is smoothing.
The details of more than one embodiment is illustrated in the following drawings and specification.From specification and accompanying drawing and in accessory rights claim, other features will be apparent.
Embodiment
Hereinafter, be easy to make those skilled in the art realize the present invention, embodiment of the present invention will be described in more detail with reference to the accompanying drawings.The present invention can realize in different forms, and is not limited to embodiment described here.In addition, in order to not fuzzy purport of the present invention redundantly, will cancel to known function or construct relevant detailed description.Similar Reference numeral refers to similar element all the time.
In addition, in whole specification, the implication of " comprising (include) ", " comprising (comprise) ", " comprising (including) " or " comprising (comprising) " specifies attribute, region, stationary digital, step, process, element and/or parts but does not get rid of other attributes, region, stationary digital, step, process, element and/or parts.
Hereinafter, with reference to Fig. 1 to Fig. 3, the circuit of power factor correction according to the embodiment of the present invention is described.
Fig. 1 is the block diagram of the circuit of power factor correction illustrated according to the embodiment of the present invention.
With reference to Fig. 1, circuit of power factor correction 100 comprises AC voltage generating unit 110, surge current limiting unit 120, AC noise removing unit 130, rectification unit 140, power factor correction unit 150, smooth unit 160, DC/DC transducer 170 and battery 180.
Power factor correction unit 150 pairs of power factors correct.
DC/DC transducer 170 will become the size of the voltage needed for charging through level and smooth voltage transitions.
Battery 180 is charged by the voltage through conversion.
The miscellaneous part of circuit of power factor correction 100 is described in more detail with reference to Fig. 2.
Fig. 2 is the circuit diagram of the circuit of power factor correction illustrated according to the embodiment of the present invention.
AC voltage generating unit 110 produces AC voltage.
Surge current limiting unit 120 comprises negative temperature coefficient (NTC) thermistor Rn 1.NTC themistor Rn 1have one end, at this end place, the AC voltage produced at one end place of AC voltage generating unit 110 is applied in.
NTC themistor Rn 1refer to the thermistor of the resistance that there is negative temperature coefficient and continue change.When AC voltage is supplied to circuit for the first time and surge current occurs, because temperature in circuit is lower, therefore NTC themistor Rn 1there is high resistance.Therefore, due to NTC themistor Rn 1resistance value, the size of the interior resistance in circuit increases, and thus according to Ohm's law (that is, V=IR (V: voltage I: electric current R: resistance)), the size of surge current reduces.By this, can affect from surge current by the device in protective circuit.In addition, when circuit enters stable state, because the temperature in circuit increases, therefore NTC themistor Rn 1there is very little resistance value.Therefore, the size of the equivalent resistance in circuit be not connected NTC themistor Rn 1situation compare can not be significantly different, make surge current limiting unit 120 less affect the original function being in the circuit of power factor correction of stable state.Stable state refers to the stable state finally reached after transient response disappears.
AC noise removing unit 130 comprises capacitor C 11.Capacitor C 11one end be connected to NTC themistor Rn 1the other end and capacitor C 11the other end be connected to the other end of AC voltage generating unit 110.AC noise removing unit 130 removes the noise of AC voltage.
Rectification unit 140 can comprise multiple diode.As shown in Figure 2, rectification unit 140 comprises four diodes.Four diodes are connected by bridge-type.Lower-left diode D among four diodes that bridge-type connects 13one end be connected to the capacitor C of AC noise removing unit 130 11the other end and lower-left diode D 13other end ground connection.Bottom right diode D among four diodes that bridge-type connects 14one end be connected to the capacitor C of AC noise removing unit 130 11one end and bottom right diode D 14other end ground connection.Upper left diode D among four diodes that bridge-type connects 11one end be connected to the capacitor C of AC noise removing unit 130 11the other end and upper left diode D 11the other end be connected to lower-left diode D 13one end.Upper right diode D among four diodes that bridge-type connects 12one end be connected to upper left diode D 11the other end and upper right diode D 12the other end be connected to bottom right diode D 14one end.Rectification unit 140 carries out rectification to have identical polar and to export it to the AC voltage eliminating noise.
Power factor correction unit 150 comprises inductor L 1, switch mosfet SW 1and diode D 15.Inductor L 1one end be connected to the upper right diode D in rectification unit 140 12one end.Switch mosfet SW 1one end be connected to inductor L 1the other end and switch mosfet SW 1other end ground connection.Diode D 15one end be connected to inductor L 1the other end.Power factor correction unit 150 is by producing the voltage after power factor correction to carrying out power factor correction through the voltage of rectification.Power factor correction unit 150 can be specially booster converter.Booster converter repeats and switches the size of the voltage through rectification to be remained unchanged and to make the phase place of electric current and voltage equal.That is, flowing through of electric current allows the current flowing scheduled time to stop the method for the scheduled time subsequently to adjust.By this operation for making the phase place of voltage equal the phase place of electric current, correct power factor.
Smooth unit 160 comprises a capacitor C 12.Especially, capacitor C 12it can be electrolytic condenser.Capacitor C 12one end be connected to diode D 15the other end and capacitor C 12other end ground connection.According to one embodiment of the invention, smooth unit 160 can comprise multiple capacitor.One end of each capacitor in multiple capacitor is connected to diode D 15the other end and the other end ground connection of each capacitor in multiple capacitor.Smooth unit 160 by removing ripple and producing DC voltage from the voltage after power factor correction.That is, the voltage after smooth unit 160 pairs of power factor corrections is smoothing.
In such embodiments, if the temperature of NTC themistor increases, then NTC themistor has little resistance value.But, because the resistance value of NTC themistor can not disappear completely, therefore there is the power loss irrelevant with power factor correction, the efficiency of circuit of power factor correction is reduced.
Fig. 3 is the flow chart of the operation of the circuit of power factor correction illustrated according to the embodiment of the present invention.
In operation S101, AC voltage generating unit 110 produces AC voltage.
In operation s 103, surge current limiting unit 120 is according to NTC themistor Rn 1temperature carry out limit inrush currents.NTC themistor Rn 1resistance value change according to temperature.Thus, NTC themistor Rn is worked as at low temperature 1resistance value be that high time surge is limited, and surge is also limited due to the low temperature when applying the initial time of AC voltage.
In operation S105, AC noise removing unit 130 removes the noise of AC voltage.
In operation S107, rectification unit 140 carries out rectification to produce the voltage through rectification to the AC voltage eliminating noise.
In operation S109, power factor correction unit 150 is by producing the voltage after power factor correction to carrying out power factor correction through the voltage of rectification.
In operation S111, the voltage after smooth unit 160 pairs of power factor corrections is smoothing.
Hereinafter, with reference to Fig. 4 to Fig. 6, circuit of power factor correction is according to another embodiment of the present invention described.
Fig. 4 is the block diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
Circuit of power factor correction 200 comprises AC voltage generating unit 210, surge current limiting unit 220, AC noise removing unit 230, rectification unit 240, power factor correction unit 250, smooth unit 260, DC/DC transducer 270, battery 280 and the control signal generation unit 290 for surge current limiting unit.Except circuit of power factor correction 200 comprises the control signal generation unit 290 for surge current limiting unit, miscellaneous part is the same with those in Fig. 1.
Control signal generation unit 290 for surge current limiting unit produces control signal and controls the switch in surge current limiting unit 220.
The miscellaneous part of circuit of power factor correction 200 is described in more detail with reference to Fig. 5.
Fig. 5 is the circuit diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
Except the circuit of surge current limiting unit 220, the circuit diagram of Fig. 5 is identical with the circuit diagram of Fig. 2 and as described with reference to fig. 4, the circuit diagram of Fig. 5 comprises the control signal generation unit 290 for surge current limiting unit further.
In the 5 embodiment of figure 5, surge current limiting unit 220 comprises relay switch SW rwith NTC themistor Rn 1.NTC themistor Rn 1there is the one end being applied with AC voltage and the capacitor C being connected to AC noise removing unit 230 11the other end of one end.Relay switch SW rthere is the one end being applied with AC voltage and the capacitor C being connected to AC noise removing unit 230 11the other end of one end.
Relay switch SW rcontrolled by the control signal for surge current limiting unit.When surge current is in the initial time flowing applying AC voltage, for the control signal generation unit 290 relay switch SW of surge current limiting unit rwith limit inrush currents.When the circuit reaches steady state, owing to unlikely there is surge current, therefore for the control signal generation unit 290 engage relay interrupteur SW of surge current limiting unit rnTC themistor is flowed into prevent electric current.In this, whether circuit of power factor correction reaches stable state and determines according to whether have passed through the predetermined reference time.When circuit of power factor correction 200, owing to usually reaching stable state within the several seconds, therefore the reference time can be set as the time of 2 seconds to 3 seconds.
According to the embodiment of Fig. 5, at relay switch SW rnot there is resistance value ideally, different from the embodiment of Fig. 2, when circuit enters stable state, do not have electric current to flow into NTC themistor Rn 1.Consequently, there is not power loss.But, comprising the relay switch SW with self-resistance parts rside circuit in, even if relay switch SW rbe switched on, some electric currents also can flow into NTC themistor Rn 1.Consequently, there is power loss.In order to prevent this power loss completely, a relay switch is connected to NTC themistor Rn 1one end.Subsequently, connect this relay switch when surge current flows into circuit and disconnect this relay switch when circuit enters stable state.But, if increase relay switch as described above, then require extra-pay and increase the volume of circuit.In addition, due to interrupteur SW rrequire mechanical contact, because which limit its life-span.And, as relay switch SW rwhen working in the hot environment of such as power inverter, the reliability of operation and life-span are also lower.
Fig. 6 is the flow chart of the operation that circuit of power factor correction is according to another embodiment of the present invention shown.
In operation S201, AC voltage generating unit 210 produces AC voltage.
In operation S203, the control signal generation unit 290 for surge current limiting unit determines whether circuit of power factor correction 200 is in transient state.Transient state refers to the state before entering stable state, that is, circuit shows the state of transient response.
If circuit of power factor correction 200 is in transient state, then, in operation S205, the control signal generation unit 290 for surge current limiting unit produces control signal to disconnect the switch in surge current limiting unit 220.
If the switch in surge current limiting unit 220 is switched on, then, in operation S207, surge current limiting unit 220 carrys out limit inrush currents according to the temperature in circuit.
If circuit of power factor correction 200 is in stable state, then, in operation S209, the control signal generation unit 290 for surge current limiting unit produces control signal to disconnect the switch in surge current limiting unit 220.
In operation S211, AC noise removing unit 230 removes the noise of AC voltage.
In operation S213, rectification unit 240 carries out rectification to produce the voltage through rectification to the AC voltage eliminating noise.
In operation S215, power factor correction unit 250 is by producing the voltage after power factor correction to carrying out power factor correction through the voltage of rectification.
In operation S217, the voltage after smooth unit 260 pairs of power factor corrections is smoothing.
Hereinafter, with reference to Fig. 7 to Fig. 9, circuit of power factor correction and method for designing are according to another embodiment of the present invention described.
Fig. 7 is the block diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
Circuit of power factor correction 300 comprises AC voltage generating unit 310, surge current limiting unit 320, AC noise removing unit 330, rectification unit 340, power factor correction unit 350, smooth unit 360, DC/DC transducer 370, battery 380 and current controling signal generation unit 390.
Surge current limiting unit 320 limits in transient state the surge current that produced by AC voltage and limited surge current is provided to smooth unit 360, and subsequently, stops providing electric current in stable state.
Rectification unit 340 stops carrying out rectification to AC voltage in transient state, and carries out rectification to produce the voltage through rectification in stable state to AC voltage.
Current controling signal generation unit 390 produces the signal for controlling surge current limiting unit 320 and rectification unit 340.
The miscellaneous part of circuit of power factor correction 300 is described in more detail with reference to Fig. 8.
Fig. 8 is the block diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
AC voltage generating unit 310 produces AC voltage.
Surge current limiting unit 320 comprises diode, switch and resistor.Diode has the one end being applied with AC voltage.Switch is connected to the other end of diode.Resistor R is connected to the other end of switch.
Especially, diode and switch can with silicon controlled rectifier (SCR) SD comprising diode and switching function 31substitute.If diode and switch SCR SD 31substitute, then reduce the size of the device required by circuit, make it possible to circuit miniaturization.In addition, due to SCR SD 31ensure that the longer life-span compared with general switch, therefore can extend the life-span of circuit.In addition, due to diode and SCR SD 31price almost there is no difference, therefore circuit manufacturing expense with use compared with extra switch and can reduce further.
When circuit is in transient state, that is, as connection SCR SD 31time, surge current flows into surge current limiting unit 320.Owing to there is resistor R in surge current limiting unit 320, so and SCRSD 31compare during disconnection, the total internal resistance value in circuit of power factor correction increases.Therefore, because the size of interior resistance increases, thus according to Ohm's law (that is, V=IR (V: voltage I: electric current R: resistance)), the size of electric current reduces, and surge current is limited.
When circuit is in stable state, that is, as disconnection SCR SD 31time, surge current does not flow into surge current limiting unit 320.Thus, be different from the embodiment shown in Fig. 1 to Fig. 6, in stable state, the power loss because surge current limiting unit 320 causes can not occur.In addition, according to this embodiment, circuit at steady operation and overcurrent flows due to external factor subsequently time, SCR SD 31can again be disconnected with protective circuit.
AC noise removing unit 330 comprises capacitor C 31.The AC voltage produced at one end place of AC voltage generating unit 310 is applied to capacitor C 31one end and capacitor C 31the other end be connected to the other end of AC voltage generating unit 310.AC noise removing unit 330 removes the noise of AC voltage.
Rectification unit 340 can comprise multiple diode and multiple switch.According to the embodiment of Fig. 7, rectification unit 340 comprises four diodes and two switches.Multiple switch can substitute with SCR with multiple tops diode of the one end being connected to the plurality of switch.
When SCR alternative switch and diode use, as mentioned above, with use switch to compare with diode circuit can be made miniaturized further and the relatively longer life-span can be ensured.In addition, because the price of diode and SCR does not almost have difference, can reduce further compared with the switch that therefore circuit manufacturing expense is extra with use.
Two diode D 33and D 34and two SCR SD 32and SD 33bridge-type connects.Left diode D among two diodes 33one end be connected to the capacitor C of AC noise removing unit 330 31one end and left diode D 33other end ground connection.Right diode D among two diodes 34one end be connected to the capacitor C of AC noise removing unit 330 31the other end and right diode D 34other end ground connection.Left SCR SD among two SCR 32one end be connected to the other end of the resistor R of surge current limiting unit 320 and left SCR SD 32the other end be connected to left diode D 33one end.Right SCR SD among two SCR 33one end be connected to the other end of the resistor R of surge current limiting unit 320 and right SCR SD 33the other end be connected to right diode D 34one end.
When being in transient state, that is, as two SCR (SD 32and SD 33) disconnect time, electric current does not flow into rectification unit 340 and flows directly to power factor correction unit 350 from surge current limiting unit 320.As two SCR (SD 32and SD 33) connect time, electric current flow into rectification unit 340.
Rectification unit 340 carries out rectification to have identical polar thus to produce the voltage through rectification to the AC voltage eliminating noise.
Power factor correction unit 350 comprises inductor L 3, switch mosfet SW 3and diode D 35.Inductor L 3one end be connected to one end of the right SCR of rectification unit 340.Switch mosfet SW 3one end be connected to inductor L 3the other end and switch mosfet SW 3other end ground connection.Diode D 35one end be connected to inductor L 3the other end.Power factor correction unit 350 can be specially booster converter.Booster converter repeats and switches the size of the voltage through rectification to be remained unchanged and to make the phase place of electric current and voltage equal.That is, flowing through of electric current allows the current flowing scheduled time to stop the method for the scheduled time subsequently to adjust.By this operation making the phase place of voltage equal the phase place of electric current, correct power factor.
Smooth unit 360 comprises a capacitor C 32.Especially, capacitor C 32it can be electrolytic condenser.Capacitor C 32one end be connected to diode D 35the other end and capacitor C 32other end ground connection.According to embodiments of the invention, smooth unit 360 can comprise multiple capacitor.One end of each capacitor in multiple capacitor is all connected to diode D 35the other end and the equal ground connection of the other end of each capacitor in multiple capacitor.Smooth unit 360 produces DC voltage by removing ripple from the voltage after power factor correction.
Fig. 9 is the flow chart of the operation that circuit of power factor correction is according to another embodiment of the present invention shown.
In operation S301, AC voltage generating unit 310 produces AC voltage.
In operation S303, current controling signal generation unit 390 determines whether circuit of power factor correction 300 is in transient state.When circuit of power factor correction 300 reaches stable state, surge current can not be there is.
Especially, stable state can be determined according to institute's elapsed time after being applied with AC voltage as the embodiment of Fig. 6.Because circuit of power factor correction 300 reaches stable state, so the reference time of stable state can be configured to the time of 2 seconds to 3 seconds being applied with in the several seconds after AC voltage.If determine stable state by a kind of so method, then it can not be determined precisely.
In order to accurately determine whether circuit of power factor correction is in stable state, whether circuit of power factor correction is in stable state can based on the capacitor C be applied in smooth unit 360 32the magnitude of voltage of one end determine.Especially, circuit of power factor correction whether be in stable state can based on being applied to the capacitor C being filled with electron charge 32the magnitude of voltage of one end whether be equal to or greater than reference voltage to determine.As capacitor C 32in when being filled with the electron charge of scheduled volume, there is not surge current.Reference voltage can be the several times of the root mean square (RMS) of the AC voltage that AC voltage generating unit 310 produces.
If circuit of power factor correction 300 is in transient state, then in operation S305, current controling signal generation unit 390 produces control signal and flows into surge current limiting unit 320 to allow electric current.That is, current controling signal generation unit 390 produces control signal with the switch connected in surge current limiting unit 320 and the switch disconnected in rectification unit 340.Owing to being connected to surge current limiting unit 320, surge current flows into surge current limiting unit 320 and is limited.
If circuit of power factor correction 300 is in stable state, then in operation S307, current controling signal generation unit 390 stops electric current flowing into surge current limiting unit 320.That is, current controling signal generation unit 390 produces control signal with the switch disconnected in surge current limiting unit 320 and the switch connected in rectification unit 340.
When circuit of power factor correction 300 is in stable state, in operation S309, AC noise removing unit 330 removes the noise of AC voltage.
If power factor circuit 300 is in stable state, then in operation S311, rectification unit 340 carries out rectification to produce the voltage through rectification to the AC voltage eliminating noise.
In operation S313, power factor correction unit 350 produces the voltage after power factor correction.
In operation S315, the voltage after smooth unit 360 pairs of power factor corrections is smoothing.
Contain above-mentioned feature, structure and effect at least one embodiment of the present invention and it is not limited to an embodiment.In addition, those skilled in the art can combine or revise for another embodiment the feature described in embodiments, structure and effect.Thus, should be understood that, contain to this combination within the scope of the invention and revise relevant content.
Although describe embodiment with reference to its multiple exemplary embodiment, but should be understood that, those skilled in the art can design by fall into principle of the present disclosure spirit and scope within many other amendment and embodiments.Especially, the part that body combination within the scope of the disclosure, accompanying drawing and appended claims is arranged and/or in arranging, multiple change and amendment are possible.Except except part and/or the change in arranging and amendment, to those skilled in the art, substituting use also will be apparent.
Accompanying drawing explanation
Fig. 1 is the block diagram of the circuit of power factor correction illustrated according to the embodiment of the present invention.
Fig. 2 is the circuit diagram of the circuit of power factor correction illustrated according to the embodiment of the present invention.
Fig. 3 is the flow chart of the operation of the circuit of power factor correction illustrated according to the embodiment of the present invention.
Fig. 4 is the block diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
Fig. 5 is the circuit diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
Fig. 6 is the flow chart of the operation that circuit of power factor correction is according to another embodiment of the present invention shown.
Fig. 7 is the block diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
Fig. 8 is the circuit diagram that circuit of power factor correction is according to another embodiment of the present invention shown.
Fig. 9 is the flow chart of the operation that circuit of power factor correction is according to another embodiment of the present invention shown.

Claims (20)

1., to the circuit of power factor correction that the power factor of AC voltage corrects, comprising:
Rectification unit, it stops carrying out rectification to AC voltage and in stable state by carrying out rectification to produce the voltage through rectification to AC voltage in transient state;
Power factor correction unit, it is by correcting the voltage after producing power factor correction to the described voltage through rectification;
Smooth unit, it is by producing through level and smooth voltage to the voltage after described power factor correction is smoothing; And
Surge current limiting unit, it provides limited current in transient state by limiting the surge current produced by AC voltage and stops electric current being provided to described smooth unit.
2. circuit as claimed in claim 1, comprise current controling signal generation unit further, whether it is in stable state according to described circuit of power factor correction, controls electric current flow to described surge current limiting unit by the current controling signal producing the described rectification unit of control and described surge current limiting unit.
3. circuit as claimed in claim 2, wherein said current controling signal generation unit produces described current controling signal based on the value of the voltage behind the one end being applied to a capacitor or the described power factor correction of one end of multiple capacitors be connected in parallel.
4. circuit as claimed in claim 3, wherein when the value of the level and smooth voltage of described warp is equal to or greater than reference voltage level, described current controling signal generation unit is by determining that described circuit of power factor correction is in stable state and prevents electric current from flowing to described surge current limiting unit.
5. circuit as claimed in claim 4, wherein when the value of the level and smooth voltage of described warp is less than described reference voltage level, described current controling signal generation unit is by determining that described circuit of power factor correction is in transient state and allows electric current to flow to described surge current limiting unit.
6. circuit as claimed in claim 1, wherein said surge current limiting unit comprises silicon controlled rectifier and described rectification unit comprises silicon controlled rectifier.
7. circuit as claimed in claim 6, wherein when described circuit of power factor correction is in stable state, described current controling signal generation unit produces control signal with the silicon controlled rectifier disconnected in described surge current limiting unit and the silicon controlled rectifier connected in described rectification unit.
8. circuit as claimed in claim 6, wherein when described circuit of power factor correction is in transient state, described current controling signal generation unit produces control signal with the silicon controlled rectifier connected in described surge current limiting unit and the silicon controlled rectifier disconnected in described rectification unit.
9. a circuit of power factor correction, comprising:
Multiple bridge diode;
Power factor correction unit, it has the input terminal of the lead-out terminal being connected to described multiple bridge diode;
Smmothing capacitor, it has the one end of the lead-out terminal being connected to described power factor correction unit;
Switch, it has the one end being applied with AC voltage;
Diode, its one end is connected to the other end of described switch;
Resistor, its one end is connected to the other end of described diode; And
Current controling signal generation unit, it is connected described switch in transient state and prevents two top bridge diodes among the described multiple bridge diode of electric current inflow, to allow described resistor, the electric current being limited size is provided to described smmothing capacitor.
10. circuit as claimed in claim 9, wherein said current controling signal generation unit, based on the magnitude of voltage of one end of described smmothing capacitor being applied to the lead-out terminal being connected to described power factor correction unit, carrys out generation current control signal.
11. circuit as claimed in claim 10, wherein when the magnitude of voltage of one end of the described smmothing capacitor being applied to the lead-out terminal being connected to described power factor correction unit is less than reference voltage level, described current controling signal generation unit determines that described circuit of power factor correction is in transient state.
12. circuit as claimed in claim 9, wherein said switch and described diode are silicon controlled rectifiers.
13. 1 kinds of methods that circuit of power factor correction is operated, the power factor of described circuit of power factor correction to AC voltage corrects, and described method comprises:
Determine whether described circuit of power factor correction is in transient state;
When described circuit of power factor correction is in the surge current that transient state limit produces by AC voltage;
When circuit of power factor correction is in stable state by carrying out rectification to produce the voltage through rectification to AC voltage;
The voltage after power factor correction is produced by carrying out power factor correction to the described voltage through rectification; And
By producing through level and smooth voltage the voltage after described power factor correction is smoothing.
14. methods as claimed in claim 13, comprise further and whether are in stable state according to described circuit of power factor correction, control whether limit inrush currents by generation current control signal.
15. methods as claimed in claim 14, whether limit inrush currents comprises in wherein said control: the value based on the voltage behind the one end being applied to a capacitor or the described power factor correction of one end of multiple capacitors be connected in parallel produces described current controling signal.
16. methods as claimed in claim 15, wherein saidly determine whether described circuit of power factor correction is in transient state and comprises: determine that described circuit of power factor correction is in stable state when the value of the level and smooth voltage of described warp is equal to or greater than reference voltage level.
17. methods as claimed in claim 16, wherein saidly determine whether described circuit of power factor correction is in transient state and comprises: determine that described circuit of power factor correction is in transient state when the value of the level and smooth voltage of described warp is less than described reference voltage level.
18. methods as claimed in claim 13, wherein limit inrush currents comprises use first silicon controlled rectifier, and produces the described voltage through rectification and comprise use second silicon controlled rectifier.
19. methods as claimed in claim 18, wherein said by carrying out rectification to produce comprising through the voltage of rectification to described AC voltage:
Disconnect described first silicon controlled rectifier; And
Connect described second silicon controlled rectifier.
20. methods as claimed in claim 18, wherein limit inrush currents comprises:
Connect described first silicon controlled rectifier; And
Disconnect described second silicon controlled rectifier.
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US20150062986A1 (en) 2015-03-05
US9337721B2 (en) 2016-05-10
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JP5902741B2 (en) 2016-04-13
KR101561341B1 (en) 2015-10-16
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CN104426348B (en) 2018-04-27
EP2843815A2 (en) 2015-03-04

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